Question

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Exchange NDR Logs

By mbarrett ·
On my exchange server, I keep getting alot of non delivery reports in the logs with strange email addresses, with Event ID either 3030 or 3018.

Example:
A non-delivery report with a status code of 4.0.0 was generated for recipient rc822;u5160286@tknet.tku.edu.tw (Message-ID <hzdnysuavvsvkaywebjzt.4509270550314035582725@yahoo.com.hk&gt
Unless I'm mistaken, this is from spam, but I've turned off open relay. What am I missing?

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